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Reality TV star Stephanie Pratt has been formally hit with a charge for driving under the influence following her arrest earlier this month.

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Pratt, who appears on U.S. show "The Hills," was pulled over by police in Hollywood on Oct. 18 and taken into custody after failing a Breathalyzer test.

The blonde was just over the .08 legal limit for California after a second breath test registered at .09, according to TMZ.com.

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Pratt, who has promised to take "full responsibility" for her mistake, was formally charged on Wednesday.

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